Q. Should one avoid placing a mezuza that has a plastic case with a letter shien (of Hashem’s name) on it, on the inside of the door-frame of a bedroom, since it may be facing issues of tznius (modesty)?
A. On a similar question (1396) we wrote: ‘Shulchan Aruch (Y.D. 286: 14) rules that it is preferable to place the mezuza of a bedroom on the frame on the outside of the door, the mezuza now being on the exterior of the room when the door is closed, thus avoiding issues of dishonoring the kedusha of the mezuza.
If it cannot be done, Horav Shlomo Miller’s Shlit’a opinion is that Hashem’s name on the mezuza case requires double covering, similar to the parchment inside. (See Agur Beohalecha 9:5, Shaarei Mezuza 18: 8). He added, that you may be lenient in need, if the name of Hashem is written or engraved vertically.
Cards and posters that have Hashem’s names or psukim, should not be displayed in a bedroom.’
In our case, since only one single letter is displayed there is more room for leniency. However, the Rov recommends that if possible it should be placed on the outside.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a